烟雾病的常春藤征

Ivy sign of moyamoya disease

烟雾病（moyamoya disease, MMD）是一种不常见的脑血管病，但在东亚人群中相对高发。常春藤征是指烟雾病患者 MRI T 1增强序列中显示的点状或线状高信号现象，主要分布于大脑皮质的软脑膜表面或蛛网膜下腔内，对于诊断烟雾病以及评估烟雾病的分期和预后均具有重要意义。文章针对这一影像学表现及其意义进行了简要综述。

Moyamoya disease is an uncommon cerebral disease, but its morbidity is relatively high in East Asian populations. Ivy sign refers to the dot or linear high signal phenomenon in MRI T1 enhanced sequence in patients with moyamoya disease. It mainly distributes in the pial surface of cerebral cortex or within subarachnoid space. It has important significance for diagnosing moyamoya disease and assessing the staging and prognosis of moyamoya disease. This article briefly reviews this imaging finding and its significance.